A new Vanderbilt University poll shows a strong preference among Tennesseans for a state-run health insurance exchange over one run by the federal government. The poll of 829 registered voters released Wednesday showed 53% favor the state-run exchange, while 33% prefer the federal approach. The results contrast with Republican Gov. Bill Haslam’s decision earlier this week not to pursue a state-run exchange. Vanderbilt officials said the governor was not aware of the poll results before Wednesday’s release. Haslam’s office did not immediately return a message seeking comment. Meanwhile, a pending decision over whether to expand Medicaid was much more evenly divided among poll respondents: 47% said they support an expansion, while 46 oppose it. Haslam has said he will decide the Medicaid issue sometime in the spring.